Is this a RegExp bug??? Matching double letters inside words...

I'm trying to match double letters inside words, excluding ones that begin or end a word. I'm running into a problem matching \B at the end of a line.
example:
My RegExp is /\Bdd\B/gi
String is "dda adda add add"
This will match twice, the dd in the 2nd word, and the dd in the 4th word. Why is it matching the 4th word??

It matches only once. Make sure there are no other characters in the end of your string.

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import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class Main extends JFrame
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Is this a RegExp bug??? Matching double letters inside words...

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